Non-Newtonian granular fluids: Simulation and theory

Meheboob Alam; S. Luding

Non-Newtonian granular fluids: Simulation and theory

Meheboob Alam, S. Luding

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

Abstract

Rheological properties of granular fluids are probed via event-driven simulations of the inelastic hard-sphere model. We find that granular fluids support large normal stress differences for the whole range of densities, clearly indicating their non-Newtonian rheology. Interestingly, both first (N ₁) and second (N ₂) normal stress differences undergo sign-reversals with density. While N ₁ changes its sign in the dense limit, N ₂ changes its sign in the dilute limit. The origin of such sign-reversals is tied to the microstructural reorganization of particles and to anisotropy in general. We briefly outline a viscoelastic constitutive model for granular fluids which allows the sign-reversals of both first and second normal stress differences.

Original language	English
Title of host publication	Powders and Grains 2005 - Proceedings of the 5th International Conference on Micromechanics of Granular Media
Pages	1141-1145
Number of pages	5
Publication status	Published - 1 Dec 2005
Externally published	Yes
Event	5th International Conference on Micromechanics of Granular Media, Powders and Grains 2005 - Stuttgart, Germany Duration: 18 Jul 2005 → 22 Jul 2005

Conference

Conference	5th International Conference on Micromechanics of Granular Media, Powders and Grains 2005
Abbreviated title	PG 2005
Country	Germany
City	Stuttgart
Period	18/07/05 → 22/07/05

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Alam, M., & Luding, S. (2005). Non-Newtonian granular fluids: Simulation and theory. In Powders and Grains 2005 - Proceedings of the 5th International Conference on Micromechanics of Granular Media (pp. 1141-1145)

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